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#include "Shader.hpp"
#include <fstream>
#include <sstream>
#include <easylogging++.h>
Shader::Shader(const GLchar *vertexPath, const GLchar *fragmentPath, const GLchar *geometryPath) {
vertex = vertexPath;
fragment = fragmentPath;
std::string vertexCode;
std::string fragmentCode;
std::string geometryCode;
std::ifstream vShaderFile;
std::ifstream fShaderFile;
std::ifstream gShaderFile;
vShaderFile.exceptions(std::ifstream::failbit);
fShaderFile.exceptions(std::ifstream::failbit);
gShaderFile.exceptions(std::ifstream::failbit);
try {
vShaderFile.open(vertexPath);
fShaderFile.open(fragmentPath);
if (geometryPath != nullptr)
gShaderFile.open(geometryPath);
std::stringstream vShaderStream, fShaderStream, gShaderStream;
vShaderStream << vShaderFile.rdbuf();
fShaderStream << fShaderFile.rdbuf();
if (geometryPath != nullptr)
gShaderStream << gShaderFile.rdbuf();
vShaderFile.close();
fShaderFile.close();
if (geometryPath != nullptr)
gShaderFile.close();
vertexCode = vShaderStream.str();
fragmentCode = fShaderStream.str();
if (geometryPath != nullptr)
geometryCode = gShaderStream.str();
}
catch (std::ifstream::failure e) {
LOG(ERROR) << "Shader source not readed";
}
const GLchar *vShaderCode = vertexCode.c_str();
const GLchar *fShaderCode = fragmentCode.c_str();
const GLchar *gShaderCode = geometryCode.c_str();
GLuint vertex, fragment, geometry;
GLint success;
GLchar infoLog[512];
vertex = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex, 1, &vShaderCode, NULL);
glCompileShader(vertex);
glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(vertex, 512, NULL, infoLog);
LOG(ERROR) << "Vertex shader compilation failed: " << infoLog;
};
fragment = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment, 1, &fShaderCode, NULL);
glCompileShader(fragment);
glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(fragment, 512, NULL, infoLog);
LOG(ERROR) << "Fragment shader compilation failed: " << infoLog;
};
if (geometryPath != nullptr) {
geometry = glCreateShader(GL_GEOMETRY_SHADER);
glShaderSource(geometry, 1, &gShaderCode, NULL);
glCompileShader(geometry);
glGetShaderiv(geometry, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(geometry, 512, NULL, infoLog);
LOG(ERROR) << "Geometry shader compilation failed: " << infoLog;
};
}
this->Program = glCreateProgram();
glAttachShader(this->Program, vertex);
glAttachShader(this->Program, fragment);
if (geometryPath != nullptr)
glAttachShader(this->Program, geometry);
glLinkProgram(this->Program);
glGetProgramiv(this->Program, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(this->Program, 512, NULL, infoLog);
LOG(FATAL) << "Shader program not linked: " << infoLog;
}
glDeleteShader(vertex);
glDeleteShader(fragment);
}
void Shader::Use() {
glUseProgram(this->Program);
}
void Shader::Reload() {
const GLchar *vertexPath = vertex;
const GLchar *fragmentPath = fragment;
this->~Shader();
new(this) Shader(vertexPath, fragmentPath);
LOG(INFO) << "Shader is realoded!";
}
GLuint NewShader::GetUniformLocation(const std::string &name) {
auto it = uniforms.find(name);
if (it == uniforms.end()) {
LOG(ERROR) << "Accessed not existing uniform " << name;
return 0;
}
return it->second;
}
NewShader::NewShader(const std::string &vertSource, const std::string &fragSource, const std::vector<std::string> &uniformsNames)
{
bool vertFailed = false, fragFailed = false, linkFailed = false, uniformsFailed = false;
const GLchar *vertSourcePtr = vertSource.c_str();
const GLchar *fragSourcePtr = fragSource.c_str();
GLuint vertex, fragment;
GLint success;
GLchar infoLog[512];
vertex = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex, 1, &vertSourcePtr, NULL);
glCompileShader(vertex);
glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(vertex, 512, NULL, infoLog);
LOG(ERROR) << "Vertex shader compilation failed: " << std::endl << infoLog;
vertFailed = true;
};
fragment = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment, 1, &fragSourcePtr, NULL);
glCompileShader(fragment);
glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(fragment, 512, NULL, infoLog);
LOG(ERROR) << "Fragment shader compilation failed: " << std::endl << infoLog;
fragFailed = true;
};
if (vertFailed || fragFailed)
throw std::runtime_error("Shaders not compiled");
program = glCreateProgram();
glAttachShader(program, vertex);
glAttachShader(program, fragment);
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(program, 512, NULL, infoLog);
LOG(ERROR) << "Shader program not linked: " << std::endl << infoLog;
linkFailed = true;
}
glDeleteShader(vertex);
glDeleteShader(fragment);
if (linkFailed)
throw std::runtime_error("Shader not linked");
for (auto &it : uniformsNames) {
GLuint location = glGetUniformLocation(program, it.c_str());
if (location == -1) {
glDeleteProgram(program);
LOG(ERROR) << "Uniform name \"" << it << "\" not found in shader";
throw std::runtime_error("Invalid uniform");
}
uniforms[it] = location;
}
}
NewShader::~NewShader()
{
if (program)
glDeleteProgram(program);
}
void NewShader::Activate()
{
glUseProgram(program);
}
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